Real Canadian Superstore / the work environment

I feel discriminated at my job, I've been working at the pharmacy since 2015. I'm not the type of person that complain but enough is enough my pharmacy manager is trying to make me quit by pushing me off the edge, i'm Still a student and I have another job but because I care a lot about my job at superstore pharmacy I do my best to help out and give as much availabilities that I can. There are a lot of student that works with me I never eared once they got yelled at in front of the customers and collegues for being available in the morning instead of the afternoon. It a lot of things I'm complaining now because I know I'm not the only one that as been through this situation and it's wrong. I want to talk to the store manager about this